cmp-field-mapping

The cmp-field-mapping element associates
a field with one or more columns to which it maps. The column can
be from a bean’s primary table or any defined secondary table. If a field is mapped to
multiple columns, the column listed first in this element is used
as a source for getting the value from the database. The columns are
updated in the order they appear. There is one cmp-field-mapping element for each cmp-field element defined
in the ejb-jar.xml file.